Program for finding the bBox of the intersection (or AND operator) of two layers

Arokia,

There are several ways this could be done - you could find the shapes and then use dbLayerAnd to create a temporary layer. Or construct point lists and use dbPointArrayAnd and figure out the bounding boxes from the results. The simplest is to use the abeLayer* functions though - these even would allow you to deal with the shapes not being in this cellVIew but lower in the hierarchy, and they also don't require temporary shapes.

abeInit(cv)
m0=abeLayerFromCellView("Metal1")
m1=abeLayerFromCellView("Metal2")
intersections=abeNewLayer()
abeLayerAnd(m0 m1 intersections)
islandIter=abeIslandIterator(intersections)
while(
  island=islandIter->next
  println(island)
)
abeDone()

Alternatively, you might be better off using tiles instead as these can retrieve the bounding box of each shape:

abeInit(cv)
m0=abeLayerFromCellView("Metal1")
m1=abeLayerFromCellView("Metal2")
intersections=abeNewLayer()
abeLayerAnd(m0 m1 intersections)
tileIter=abeTileIterator(intersections)
while(
  tile=tileIter->next
  println(tile->bbox)
)
abeDone()

Andrew

Hi Andrew,

I was exactly looking for this I want to create a layer on these intersections.
What if the intersection points are in the form of polygon.
How should I create a layer on that polygon?

Thanks in advance
Teja.

Teja,

The abeIslandIterator will return the points in a polygon. However, you could just use abeLayerToCellView(intersection "M2") for example (silly example) - that would create shapes on M2 for all the intersection points.

Andrew

Hello Andrew. 

Is there a way to save the intersection shapes to a new layer (which doesn't exist in the technology database)?

For example: abeLayerToCellView(intersection "Outline")

Also, is there a way to merge all the abutted intersection shapes and get the outline polygon?

Thanks,

Anmol

Hello Andrew,

Found the answer to the second question above in another thread, answered by you.

That is an option to merge all the abutted intersection shapes and get the outline polygon.

Kindly help with the first question above.

Thanks,

Anmol

Anmol,

Anmoljot said:

Is there a way to save the intersection shapes to a new layer (which doesn't exist in the technology database)?

For example: abeLayerToCellView(intersection "Outline")

Well, you could create a new layer and layer-purpose using techCreateLayer and techCreateLP - if done in memory, then this would be discarded on exit (and can be done if the technology is readonly). You could also iterate over the islands (using abeIslandIterator) and then use dbCreatePolygon to create the resulting polygons, specifying an unused layer number. 

However, I'm uncertain why you'd want to do this - the layer would either then not be visible or interactable with after quitting and restarting, or immediately if you just used the layer number.

Perhaps you should just use one of the system reserved layers (e.g. y0-y9)?

Andrew